alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET DELETED Opera User-Agent Flowbit Set"; flow:established,to_server; content:"|0d 0a|User-Agent|3A| Opera/"; nocase; flowbits:set,ET.opera.useragent.request; flowbits:noalert; classtype:not-suspicious; sid:2010873; rev:5; metadata:created_at 2010_07_30, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)